# Question: the life expectancy of a particular brand of battery for...

###### Question details

The life expectancy of a particular brand of battery for
wristwatch is normally distributed with a mean of 20,000 hours and
a standard deviation of 4,000 hours. What is the probability that a
randomly selected battery will have a life of at least 17,000
hours:

Select one:

A. 0.2266

B. 0.7266

C. 0.7734

D. Cannot be determined with the given information

The life expectancy of a particular brand of battery for
wristwatch is normally distributed with a mean of 20,000 hours and
a standard deviation of 4,000 hours. What is the life expectancy of
a randomly selected battery that has the probability of 0.90:

Select one:

A. 25,120 hours

B. 25,160 hours

C. 29,600 hours

D. 29,800 hours